Good tip. Thanks Bob.
Best regards - Bry Carling AF4K
> On Aug 10, 2014, at 6:27 PM, Robert <rmcgraw@blomand.net> wrote:
>
> Please don't use used or pulls for a 2 tube amp. The way they're designed
> one tube may be drawing 60 Ma grid current and the other 200 ma. Yet a total
> of 260 ma would be normal.
>
> Grid to filament is the more common failure mode as the result of excessive
> grid current.
>
> Some one posted earlier about buying 2 used tubes and one failed after only a
> few hours. It is reported to have taken out the bias ckt. Evidence of a grid
> to filament short.
>
> 73
> Bob K4TAX
>
>
> Sent from my iPhone
>
>> On Aug 10, 2014, at 6:08 PM, Brian Carling <bcarling@cfl.rr.com> wrote:
>>
>> Are there other sources for 3-500Z tubes? Such as NOS Eimacs? Or broadcast
>> pulls?
>>
>> Best regards - Bry Carling
>>
>>
>>
>>> On Aug 10, 2014, at 2:08 PM, "Duane Calvin" <ac5aa1@gmail.com> wrote:
>>>
>>> This was certainly true of the EIMAC tubes, as long as you cared well for
>>> them. I've not had as good a luck with the current Chinese-sourced tubes
>>> (specifically, the 3-500ZG's from RF Parts, which the Centurion uses.)
>>>
>>> 73, Duane
>>>
>>> Duane Calvin, AC5AA
>>> Austin, Texas
>>> www.ac5aa.com
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Wade Staggs
>>> Sent: Sunday, August 10, 2014 12:54 PM
>>> To: Discussion of Ten-Tec Equipment
>>> Subject: Re: [TenTec] Hercules 444 amp
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